Design of Pile Foundations in Soft Deposits

연약지반에서의 말뚝기초의 설계

  • Kim, Ju-Hyong (Korea Institute of Construction Technology.) ;
  • Kwon, Oh-Sung (Technology Research Institute, Daelim Industrial Co., Ltd.) ;
  • Kim, Myoung-Mo (Dept. of Civil, Urban and Geosystem Engineering, Seoul National University.)
  • 김주형 (한국건설기술연구원) ;
  • 권오성 ((주)대림산업 기술연구소) ;
  • 김명모 (서울대학교 지구환경시스템공학부)
  • Published : 2005.03.25

Abstract

The negative skin friction on piles, which are installed in currently consolidating soft deposits, creates significant problems on the stability of pile foundations. This study investigated whether or not the pile foundation designs were appropriate in soft deposits with large amount of consolidation settlement. The final settlements of the grounds along the pile depth were estimated by the soil parameters obtained from the laboratory tests and by the field-measured settlement curves, if they were available. The displacement of the piles along the pile depth was estimated by both the load transfer method and the numerical method. Both methods gave similar locations of neutral points and magnitudes of the maximum axial forces. The movements of the ground and the piles were compared to calculate the down drag acting on piles. For the piles whose bearing capacities were less than the design loads including the down drag, slip layer coatings and/or incrementing of the penetration depth into the bearing stratum were proposed to improve the piles capacities.

Keywords